The state will be on the hook for overtime hours related to the repair, but Everhart said exactly what that cost is has not yet been computed.

Connecticut owns the rails and bridges between the New York border and New Haven, but it contracts with Metro-North to repair and maintain them.

Friday's incident in Norwalk came just four weeks after a train collision in Bridgeport that happened after one train derailed. Some rail advocates are concerned Connecticut's rail infrastructure is antiquated, and when the bridge got stuck open, the initial suspicion was the fault lay in the age of the structure.